JP2022008853A - Copper cooling plate with wear resistant inserts, for blast furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling plate having improved abrasion resistance for use in a blast furnace.

SOLUTION: A cooling plate (1) comprises a copper body (2) having an inner face (3) comprising ribs (4-1, 4-2) parallel to each other. The ribs have first extremities (6) facing each other and are separated by grooves (5) having second extremities (7) facing each other. At least one of these ribs (4-1) comprises at least one receiving part (8) located between its first extremities (6), and the receiving part comprises at least one insert (9) made of a wear resistant material that increases locally the wear resistance of this rib (4-1).

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a blast furnace, and more specifically to a cooling plate (or stave) fixed to the blast furnace.

As is known to those of skill in the art, blast furnaces typically have an inner wall partially covered by a cooling plate (or stave).

In some embodiments, these cooling plates (or stave) feature a body with an inner (ie, hot) surface. The inner (ie, hot) surface has ribs parallel to each other. These ribs are separated by grooves that are also parallel to each other. These ribs and grooves are arranged to allow the fixation of heat resistant linings (brick or gnite) or the fixation of adduct layers inside the blast furnace.

If the body is made of copper or a copper alloy to provide good thermal conductivity, the ribs will corrode faster because copper is not a wear resistant material.

To avoid such premature corrosion, a steel piece is introduced into the groove, against the side wall of the rib and the base of the groove, as described in the patent document of European Patent No. 2285991, of the rib. It is possible to improve the hardness. Such a steel piece allows for good protection of the ribs and also allows the stave to expand and deform freely as the steel piece thermally adapts to the deformation of the stave. However, the steel pieces are not cooled properly and may be eroded by gas.

European Patent No. 2285991

Therefore, an object of the present invention is to improve this situation.

For this reason, the present invention relates to a cooling plate (stage) for use in a blast furnace, comprising a copper body having an inner surface with ribs parallel to each other. The ribs are arranged parallel to each other, have first ends facing each other, and are separated by a groove having a second end facing each other.

The cooling plate (or stave) is characterized in that at least one of its ribs comprises at least one housing. The receptacle is located between its first ends and comprises at least one insert made of a wear resistant material that locally increases the wear resistance of the rib.

The cooling plates (or stave) of the present invention may also be considered separately or may also have the following optional features relating to all possible technical combinations:

-Abrasion resistant materials may be selected from the group containing metals and ceramics,
-Abrasion resistant metal may be wear resistant steel or cast iron,
The wear-resistant ceramic may be silicon carbide, extruded silicon carbide, or other heat-resistant material with good resistance to exfoliation and high hardness.
-In the first embodiment, each receptacle may be a slot comprising an insert.
-In the second embodiment, each receiving part may be a screw hole into which a bolt defining an insert is screwed.
-At least one of the grooves extends between its second ends and comprises at least one layer made of a wear resistant material that locally increases the wear resistance of adjacent ribs, multiple layers. May have at least some of the protrusions on the surface,
The multi-layered protrusion comprises a first layer formed of a material having high thermal conductivity and a second layer formed of a wear resistant material and located at the top of the first layer. May be
The material of the first layer may be selected from the group containing the highly conductive metals copper and copper alloys.
• Each protrusion in multiple layers may be combined with a single groove,
The third layer of protrusions is sandwiched between the first layer and the second layer and is made of a material having a hardness intended to improve the hardness of the plurality of layers of protrusions. May have more layers,
The third layer may be made of a ceramic with good resistance to delamination and high hardness, such as SiC or extruded SiC.
-In the modified form, each of the first and second layers of the multi-layered projections may be coupled to two adjacent grooves, respectively.
Each first layer of the multi-layered protrusions extends between the second ends and has other inserts made of a material having a hardness intended to increase the hardness of this first layer. May have slots,
Other inserts may be made of ceramic or wear-resistant and / or heat-resistant steel.
-The inner surface of the copper body may have ribs with at least two different heights,
-The groove may have a dovetail-like cross section.

The present invention also relates to a blast furnace equipped with at least one cooling plate, as introduced above.

Other features and advantages of the invention will be apparent from the detailed description given below as instructions and not limiting by any method, with reference to the accompanying drawings below.

It is the schematic which shows a part of the 1st example of the embodiment of the cooling plate which concerns on this invention by the perspective view. It is the schematic which shows a part of the 2nd example of the embodiment of the cooling plate which concerns on this invention by sectional drawing. It is the schematic which shows the deformation form of the cooling plate shown in FIG. 2 in the cross-sectional view. It is the schematic which shows a part of the 3rd example of the embodiment of the cooling plate which concerns on this invention by sectional drawing. It is the schematic which shows a part of the 4th example of the embodiment of the cooling plate which concerns on this invention by sectional drawing. It is the schematic which shows a part of the 5th example of the embodiment of the cooling plate which concerns on this invention by sectional drawing.

It is an object of the present invention to propose a cooling plate (or stave) 1 that can be used in a blast furnace and has improved wear resistance.

An example of an embodiment of the cooling plate (or stave) 1 according to the present invention is shown in FIG. Such a cooling plate (or stave) 1 is intended to be attached to the inner wall of the blast furnace.

As shown in the figure, the cooling plate (or stave) 1 according to the present invention includes a copper main body 2. The copper body 2 has an inner (ie, hot) surface 3 with several ribs 4-j parallel to each other. These ribs 4-j have two first ends 6 facing each other and are separated by a groove 5 having two second ends 7 facing each other. When the cooling plate 1 is attached to the inner wall of the blast furnace, its ribs 4-j and grooves 5 are arranged horizontally. In this case, the copper body 2 is on the opposite side of the inner surface 3 and includes an outer surface 14 fixed to the inner wall of the blast furnace. Therefore, the inner surface 3 is a surface of a main body that can come into contact with a very high temperature material and a gas existing in the blast furnace.

For example, as shown in FIGS. 3-6, the groove 5 optimizes the fixation of the adduct layer 15 produced by the treatment if it does not include the optional multi-layer projections 10 (described below). In order to do so, it may have an ant mortise-like cross section. However, the ribs 4-j and the groove 5 may have other cross-sectional shapes. Therefore, as shown in FIGS. 1 and 2, for example, the ribs 4-j and the groove 5 may have a rectangular cross section.

Further, as shown in the non-limiting example of FIG. 1, the inner surface 3 of the copper body 2 may include ribs 4-j with at least two different heights h1 and h2. This optional selection makes it possible to optimize the fixation of the heat-resistant brick 15. In the example of FIG. 1, the first rib 4-1 (j = 1) has a first height h1 and a second rib 4-2 (defined between the first ribs 4-1). j = 2) has a second height h2, which is smaller than the first height h1. However, as shown in other examples of the embodiments of FIGS. 2 to 6, the copper body 2 may have ribs 4-1 of the same height.

Furthermore, as shown in FIGS. 2 and 3, the copper body 2 preferably comprises an internal channel 16 through which the cooling fluid flows.

As shown in FIGS. 1 to 6, at least one of the ribs 4-j includes at least one receiving portion 8. The receiving portion 8 is located between the first ends 6 of the ribs 4-j and comprises at least one insert 9 made of a wear-resistant material that locally increases the wear resistance of the ribs 4-j. ing.

Thanks to the rib insert 9, the wear resistance of rib 4-j can be significantly increased, thereby avoiding premature corrosion of the material of rib 4-j (ie copper or copper alloy). become.

In the non-limiting example of FIG. 1, only the first rib 4-1 comprises at least one acceptor 8 comprising at least one insert 9. This is due to the fact that the second height h2 of the second rib 4-2 is too small to allow the receptor (s) 8 to be defined.

For example, the wear resistant material of the insert 9 may be metal or ceramic. The wear resistant metal is, for example, steel or cast iron, preferably a heat resistant grade (eg, in chemical composition, 0.3% ≤ C ≤ 0.5%, 1% ≤ Si ≤ 2 by weight. Includes the contents indicated by 5.5%, 12 ≦ Cr ≦ 14%, Mn ≦ 1%, Ni ≦ 1%, P ≦ 0.04%, S ≦ 0.03%, and Mo ≦ 0.5%. Heat resistant cast steel such as GX40CrSi13) or wear resistant steel capable of functioning at high temperatures. Abrasion resistant ceramics can be, for example, silicon carbide (SiC), extruded silicon carbide (higher thermal conductivity), or other heat resistant materials with good resistance to peeling and high hardness. ..

If at least one rib 4-j comprises at least one acceptor 8, each acceptor 8 may be a slot comprising at least one insert 9. This is especially the case of the examples shown in FIGS. 1 to 3. Only one slot 8 in which the ribs 4-j extend between the first ends 6 and optionally (as shown) from one first end 6 to the opposite end 6 or the first thereof. It is important to note that between the ends 6 may be provided with at least two slots 8, preferably defined along the same axis. Further, each slot 8 may include one or more inserts 9 arranged one after the other. Each slot 8 may be defined by machining, eg, a drill bit.

In the modified form, although not shown, each receiving portion 8 may be a screw hole into which a bolt defining the insert 9 is screwed. Ribs 4-j have only one screw hole 8 defined between their first ends 6 or at least two screw holes defined between their first ends 6 preferably along the same axis. It is important to note that 8 may be provided. Each screw hole 8 may be defined by machining, eg, a drill bit. Preferably, the holes 8 and thus the bolts 9 are provided in front of the cooling channel 16 in order to protect and reduce the number of the bolts 9. In this case, the bolt 9 is not only well connected to the copper (through the threads), but also well cooled.

Further, as shown in FIGS. 4 to 6, at least one of the grooves 5 of the copper main body 2 may include at least a part of the protrusions 10 having a plurality of layers. The multi-layered projection 10 comprises at least one layer 12 made of a wear-resistant material that extends between its second ends 7 and locally increases the wear resistance of adjacent ribs 4-j. There is.

Thus, in this last option, one or some ribs 4-j are located between its first ends 6 and include at least one insert 9 made of a wear resistant material. Multiple, comprising at least one receiving portion 8, one or several grooves 5 extending between its second ends 7 and comprising at least one layer 12 made of a wear resistant material. It comprises at least a portion of the protrusions 10 of the layer.

Thanks to the multi-layered protrusion 10 (located in the groove 5), the velocity and pressure exerted by the downward load on the stave is clearly reduced, thereby making those materials (ie, copper or copper alloy). ), And it becomes possible to avoid premature corrosion of the stave body. In other words, the protrusions allow for areas with less material movement to minimize wear.

The wear-resistant material of each layer 12 is preferably the same material as the material of the insert 9. Therefore, the wear resistant material of each layer 12 may be metal or ceramic as described above for the insert 9.

When the at least one groove 5 includes at least a part of the plurality of layers of protrusions 10, the plurality of layers of protrusions 10 are wear resistant to the first layer 11 made of a material having high thermal conductivity. It may have a second layer 12 which is made of material and is located on top of this first layer 11. This is especially the case of the examples shown in FIGS. 4 to 6. Contrary to the previous embodiment (shown in FIGS. 1 to 3), this embodiment allows the application of conventional cooling plates without any machining phase. ..

The first layer 11 having high thermal conductivity is arranged at the lowest position of the protrusions 10 of the plurality of layers and functions as a heat shield. The reason for this is that the thermal load comes primarily from the hot gas stream flowing upwards. For example, the material of this first layer 11 may be copper or a copper alloy, which is a highly conductive metal. The second layer 12 is made of a wear resistant material and is located on top of the first layer 11 to protect the first layer 11 from premature corrosion. As mentioned above, the second layer 12 can be made of wear resistant steel, cast iron, or ceramic.

Again, for example, as shown in FIGS. 4 and 5, each of the multi-layered projections 10 can be coupled to a single groove 5. In other words, each portion of the multi-layered protrusions 10 is located within a single groove 5, while the rest of the multi-layered protrusions 10 extend beyond the single groove 5. There is.

In this case, each of the plurality of layers of protrusions 10 is sandwiched between the first layer 11 and the second layer 12, and has a very high hardness intended to increase the wear resistance of the entire protrusions. It may further include a third layer 13, which is made of the ceramic material it has.

In the example of FIG. 4, each of the third layers 13 is in contact with a portion of the inner surface 3 that defines the boundary of the base of the groove 5 to which it is coupled, while in the example of FIG. Each of the layers 13 is separated from the portion of the inner surface 3 that defines the boundary of the base of the groove 5 to which it is coupled by the protrusion of the first layer 11 located below. The alternative form shown in FIG. 4 can be installed on the stave from the front side, while the alternative form shown in FIG. 5 can be installed only from the side inside the groove. The advantage of this lateral installation variant is the higher stability of the arrangement when the brittle ceramic piece breaks into pieces.

For example, each of the third layers 13 may be made of a high hardness ceramic such as SiC or extruded SiC. Ceramics can be used here because they are sandwiched and thus protected from the impact of falling material and are not related to the bending of the cooling plate that can occur due to thermal expansion.

In the modified embodiment shown in FIG. 6, the first layer 11 and the second layer 12 of each of the plurality of layers of protrusions 10 may be coupled to two adjacent grooves 5, respectively. .. In other words, a part of the first layer 11 of the plurality of layers of protrusions 10 is arranged in the first groove 5, while the rest of the first layer 11 forms the first groove 5. A portion of the second layer 12 of the multi-layered projection 10 extending beyond is disposed within the second groove 5 located proximal to the first groove 5, while the second. The rest of the layer 12 extends beyond this second groove 5. Therefore, the lower first layer 11 directs the thermal load to the copper body 2, while the top second layer 12 protects the bonded first layer 11 from wear.

In this case, as shown in the non-limiting example of FIG. 6, each first layer 11 of the plurality of layers of protrusions 10 extends between the second ends 7 and comprises a slot 17 with another insert 18. May be. The other insert 18 embedded in the first layer 11 is made of a material having a hardness intended to improve the hardness of the first layer 11. For example, as shown in the non-limiting example of FIG. 6, the surface of the first layer 11 in which the slot 17 is defined (ie, machined) sends gas outwards and the load is smoothly projected. It may be tilted to assist in flowing into the "pocket" constructed of 10.

Again, for example, as shown in FIG. 6, each of the other slots 17, and thus the other inserts 18 coupled, may have a dovetail-like cross section.

Again, for example, each of the other inserts 18 may be made of ceramic, such as SiC, or steel (wear resistant, heat resistant, or a combination of both). Other embodiments for increasing the hardness of layer 11 can be used. For example, each slot 17 may be a screw hole into which a bolt defining an insert 18 is screwed.

Note that if the cooling plate 1 also includes the multi-layered protrusions 10, the groove 5 in which the multi-layered protrusions 10 are located may depend on the shape and / or dimensions of the blast furnace. is important. For example, in the example shown in FIGS. 4 and 5, the protrusions 10 having a plurality of layers may be arranged in each of the three grooves 5. However, in another example, the plurality of layers of protrusions 10 may be arranged every two grooves 5, every four grooves 5, or even every five grooves 5.

As shown in FIGS. 4 to 6, when the cooling plate 1 includes the protrusions 10 having a plurality of layers, the boundary of the groove 5 having the protrusions 10 having the plurality of layers is defined, or the boundaries of the grooves 5 having the protrusions 10 are defined. The ribs 4-j fitted into the protrusions 10 do not actually need to have a receptacle (s) 8 with inserts (s) 9 which are the reasons for this. This is because it is already protected by these multi-layered protrusions 10. Therefore, preferably, only ribs 4-j, which are not located proximal to the multi-layered projections 10, are provided with a receptacle (s) 8 with inserts (s) 9 and inserts (s) 9. There is.

Claims (18)

A cooling plate (1) for a blast furnace,
The cooling plate (1) is
A copper body (2) having an inner surface (3) with ribs (4-j) parallel to each other.
The ribs (4-j) are separated by a groove (5) having a first end (6) facing each other and having a second end (7) facing each other.
At least one of the ribs (4-j) comprises at least one receiving portion (8), the receiving portion of which is located between the first ends (6) and is resistant to the ribs (4-j). It comprises at least one insert (9) made of a wear resistant material that locally increases wear resistance.
A cooling plate (1), characterized in that. The cooling plate of claim 1, wherein the wear resistant material is selected from the group comprising metals and ceramics. The cooling plate according to claim 2, wherein the wear-resistant metal is wear-resistant steel or cast iron. The cooling according to claim 2, wherein the wear-resistant ceramic is silicon carbide, extruded silicon carbide, or another heat-resistant material having good resistance to peeling and high hardness. plate. The cooling plate according to any one of claims 1 to 4, wherein each receiving portion (8) is a slot including an insert (9). The cooling plate according to any one of claims 1 to 4, wherein each receiving portion (8) is a screw hole into which a bolt defining the insert (9) is screwed. At least one of the grooves (5) comprises at least a portion of the multi-layered projections (10), the multi-layered projections extending between the second ends (7) and adjacent ribs (4-j). It comprises at least one layer (12) formed of the wear resistant material, which locally increases the wear resistance of the material.
The cooling plate according to any one of claims 1 to 6, wherein the cooling plate is characterized in that. The plurality of layers of protrusions (10) are formed of a first layer (11) made of a material having high thermal conductivity and a wear-resistant material, and are formed on the top of the first layer (11). The cooling plate according to claim 7, wherein the cooling plate comprises a second layer (12) arranged in. The cooling plate according to claim 8, wherein the material of the first layer (11) is selected from a group containing copper and a copper alloy which are highly conductive metals. The cooling plate according to any one of claims 8 and 9, wherein each of the plurality of layers of protrusions (10) is coupled to a single groove (5). Each of the plurality of layers of protrusions (10) may be sandwiched between the first layer (11) and the second layer (12) to improve the hardness of the plurality of layers of protrusions (10). 10. The cooling plate of claim 10, further comprising a third layer (13), which is made of a material having the intended hardness. 11. The cooling plate according to claim 11, wherein the third layer (13) is made of a ceramic having good resistance to peeling and high hardness, such as SiC or extruded SiC. .. A claim, wherein each of the first layer (11) and the second layer (12) of the plurality of layers of protrusions (10) is coupled to two adjacent grooves (5), respectively. The cooling plate according to any one of items 8 and 9. The first layer (11) of each of the plurality of layers of protrusions (10) comprises a slot (17).
The slot extends between the second end (7) and comprises another insert (18) made of a material having a hardness intended to increase the hardness of the first layer (11). ing,
13. The cooling plate according to claim 13. 14. The cooling plate of claim 14, wherein the other insert (18) is made of ceramic or wear-resistant and / or heat-resistant steel. One of claims 1 to 15, wherein the inner surface (3) of the copper body (2) comprises ribs (4-j) having at least two different heights. The cooling plate described in. The cooling plate according to any one of claims 1 to 16, wherein the groove (5) has a dovetail-shaped cross section. A blast furnace comprising at least one cooling plate (1) according to any one of claims 1 to 17.

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